Answers

To use things like StackLayout, you have to have some additional references (specifically to Xamarin.Forms). We've actually updated that class (CSC105) and dropped the Xamarin.Forms bits since they are a bit more advanced than where you likely are by the time you hit that class. Instead, we focus on Console-based apps in that class. Finish that series and then take the XAM120 class instead to get an introduction to Xamarin.Forms.